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Related Experiment Videos

Arsoniumphospholipid in algae.

R V Cooney1, R O Mumma, A A Benson

  • 1Marine Biology Research Division, Scripps Institution of Oceanography, La Jolla, California 92093.

Proceedings of the National Academy of Sciences of the United States of America
|September 1, 1978
PubMed
Summary
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Marine algae form a novel arsenic-containing phospholipid, O-phosphatidyltrimethylarsoniumlactic acid, as a key arsenic detoxification pathway. This compound

Area of Science:

  • Marine biology
  • Environmental chemistry
  • Biochemistry

Background:

  • Arsenic is a toxic metalloid with complex environmental and biological interactions.
  • Marine algae play a crucial role in biogeochemical cycles, including arsenic transformation.
  • Understanding arsenic metabolism in marine organisms is vital for assessing food chain risks.

Purpose of the Study:

  • To identify and characterize novel arsenic-containing compounds in marine algae.
  • To elucidate the structure and formation pathway of an arsenic phospholipid.
  • To investigate the role of this phospholipid in arsenic detoxification and accumulation.

Main Methods:

  • Culturing marine algae with radiolabeled arsenate ([(74)As]arsenate).
  • Two-dimensional paper radiochromatography for separating labeled compounds.

Related Experiment Videos

  • Chemical (base-catalyzed deacylation) and enzymatic hydrolysis for structural analysis.

    • Main Results:

    • A novel arsenic-containing phospholipid, O-phosphatidyltrimethylarsoniumlactic acid, was identified in all cultured marine algae.
    • This phospholipid serves as a major reservoir for arsenic detoxification in algae.
    • Degradation products include trimethylarsoniumbetaine, dimethylarsinic acid, methanearsonic acid, and arsenate.

    Conclusions:

    • Marine algae detoxify arsenate by forming a unique arsonium phospholipid.
    • This phospholipid is a significant component of arsenic cycling in marine ecosystems.
    • Further research is needed on its fate in marine food chains and human metabolism.